A Performance-Based Highway Geometric Design Process (2016) / Chapter Skim
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A-1 This memorandum outlines the approach for screening Sellwood Bridge Project concepts and evaluating alternatives adopted by the Policy Advisory Group on January 29, 2007. The outcome of this evaluation process will be the selection of a few alternatives to be analyzed in the Draft Environmental Impact Statement (Draft EIS)
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A-2 A performance-Based Highway Geometric design process The framework serves three primary purposes. First, it ensures that all project alternatives address the project's purpose and need.
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example performance Criteria Memorandum A-3 • Evaluate alternatives, and • Select alternatives for more detailed analysis in the Draft EIS. Screening of Concepts Using Threshold Criteria The first step of alternative evaluation is to compare a wide variety of concepts against a set of threshold criteria.
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A-4 A performance-Based Highway Geometric design process Alternative Number Identified Project Need, from Project Purpose and Need Statement Threshold Criteria 1 Provide structural capacity to accommodate safely various vehicle types, including transit vehicles, trucks, and emergency vehicles; and to withstand moderate seismic events. Concept must accommodate AASHTO1/Oregon Department of Transportation (ODOT)
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example performance Criteria Memorandum A-5 Aesthetics Goal: Ensure an aesthetically pleasing solution that enhances visual quality to the bridge, on the bridge, and from the communities on both sides of the river. (Table A-2)
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A-6 A performance-Based Highway Geometric design process Community Quality of Life Goal: Protect and preserve the existing quality of life of the neighborhoods in the Sellwood Bridge influence area on both sides of the Willamette River. (Table A-4)
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example performance Criteria Memorandum A-7 Criteria Measure 1 Minimize congestion delay in bridge area Vehicle hours of delay along the following corridors: OR 43 between Lake Oswego and Taylors Ferry Tacoma Street between 6th and 17th 99E to Taylor's Ferry Hwy 224 to 17th to Macadam and Taylor's Ferry Taylor's Ferry between Terwilliger and OR 43 2 Improve accessibility to residences and businesses Area within a 20-minute travel time contour from the center of the Sellwood Bridge 3 Minimize impact of incidents and allow the passing of emergency vehicles Combined width of travel lane and shoulders (curb to curb) 4 Accommodate trucks Combined width of travel lane and shoulders (curb to curb)
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A-8 A performance-Based Highway Geometric design process Natural Environment Goal: Preserve or improve the natural environment. (Table A-8)
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example performance Criteria Memorandum A-9 Criteria Measure 1 Maximize use of materials from existing bridge Percentage of project materials obtained from existing bridge 2 During construction, maximize use of materials from existing bridge; reuse and recycle. (Will be considered during final design and construction contracting procurement)
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A-10 A performance-Based Highway Geometric design process Design Feature Design Criteria Source Classification District Collector Community Corridor City Bikeway City Walkway Minor Truck Street Major Emergency Response Street Transit Access Street City of Portland's Transportation System Plan (TSP) Design Vehicle WB-67 Roadway Working Group Design Speed 35 mph City of Portland Stopping Sight Distance 250 feet (design speed dependent)
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example performance Criteria Memorandum A-11 Major Emergency Response Street Major Emergency Response Routes are not eligible for traffic slowing devices City of Portland's Transportation System Plan (TSP) Travel Lane Width7 Minimum Desirable Min.
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A-12 A performance-Based Highway Geometric design process Design Standards Highway 43 Design Standards 8Oregon Department of Transportation, Highway Design Manual. Design Feature Design Criteria Source Classification Non-Designated Urban Highway, Urban Fringe / Suburban ODOT HDM 8 Design Vehicle WB-67 ODOT HDM Design Speed 40 mph ODOT HDM Stopping Sight Distance 305 feet (design speed dependent)
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example performance Criteria Memorandum A-13 Design Standards Highway 43 Interchange/Intersection Design Standards 9Oregon Department of Transportation, Highway Design Manual. 10"Accommodate" refers to the ability to make the maneuver by encroaching on other lanes, shoulders, or over mountable curbs.
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